Andrey (azangru) wrote,

In his mini-course Build Your Own RxJS Pipeable Operators, John Lindquist starts off by overriding an undocumented method in the Subscriber class:

class DoubleSubscriber extends Subscriber {
  _next(value) {
    console.log(value) * 2)


No-one, without looking into the source code of RxJS, would even know that the Subscriber class has a _next method or a destination object. It is not in the public contract of the Subscriber class.

I wonder if it's a good practice to even touch the internals of a library, let alone build teaching materials that rely on this.

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